<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        div {
            width: 100px;
            height: 100px;
            border-width: 1px 3px;
            border-style: solid dashed dashed dotted;
            border-color: red yellow blue green;
            text-align: center;
            /*顺时针*/
            /*参数3个 中间为右边/左边*/
            /*参数2个 上下 左右*/
        }
    </style>
</head>
<body>
    <div></div>
</body>
</html>